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-rw-r--r--Build/source/utils/asymptote/lex.yy.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/utils/asymptote/lex.yy.cc b/Build/source/utils/asymptote/lex.yy.cc
index 3b82bfa9671..3cbf4000837 100644
--- a/Build/source/utils/asymptote/lex.yy.cc
+++ b/Build/source/utils/asymptote/lex.yy.cc
@@ -1085,7 +1085,7 @@ static int input (void );
/* This used to be an fputs(), but since the string might contain NUL's,
* we now use fwrite().
*/
-#define ECHO fwrite( yytext, yyleng, 1, yyout )
+#define ECHO do { if (fwrite( yytext, yyleng, 1, yyout )) {} } while (0)
/* %endif */
/* %if-c++-only C++ definition */
/* %endif */